Valve device



Oct. 6, 1942. E. oE'nKER 2,297,797

'VALVE DEVICE Filed May 1'?, 1941 2 sheets-sheet 1 Oct. 6, 1942.

E. OETIKER VALVE DEVICE Filed May 1'7, 1941 2 Sheets-Sheet 2 www@ W@ Patented Oct. 6, 1942 UNITED s'rxrss Param orFicE VALVE DEVICE Edwin Oetiker, Zurich-Albisrieden, Switzerland Application May 17, 1941, Serial No. 394,008

5 Claims.

The present invention relates to a valve device to be disposed in pipes, more particularly pipes for highly tensioned gases, air, or a fluid under pressure, said device being of the type which can be employed for engine brakes for motor vehicles. Closure devices of this kind are known, for instance from my previous Patent No. 2,090,896, in which a main valve and an auxiliary valve serving for pressure relieving are provided, the two valves being each disposed on a rotating or rocking arm which perform the adjustment of the main valve and the auxiliary valve.

The main object of the invention is to simplify the valve mechanism and to provide means to positively interconnect the main valve with the auxiliary valve.

Further objects Will appear in the following description.

The invention is more particularly described with reference to the accompanying drawings, which show a cut-off device tted in the exhaust pipe for an engine brake.

Figs. 1 and 3 are each an axial section on the lines I-I, III-III of Fig. 2,

Fig. 2 is a section along the line II-II in Fig. l.

Fig. 4 is another section along the line II-II in Fig. 1.

The exhaust pipe I opens into the cover 2 of a brake casing 3, to Which casing the outlet pipe 4 is connected col-axially to the exhaust pipe I. A slide valve face 5 is disposed in the casing 3. The valve face has a main admission passage 6 located co-axially to the pipes I and 4, and also a by-pass passage 'I disposed laterally thereof. The passage 6 is controlled by means of the main valve 8 and the by-pass passage l by the auxiliary valve 9. The main valve 8 is mounted on the rocking arm I0, which is pivoted on points at I I in the upper portion of the casing. The auxiliary valve 9 is mounted on an actuating arm I2, which forms part of an actuating shaft I3. To the shaft I3 is secured an operating lever I4, which forms part of the brake lever gear, said gear being adjustable by hand or foot. The shaft I3 is rotatably supported at both ends, one end having a gastight seat in a bore of the casing passing through the slide valve face 5. The outer end of the actuating shaft I3 is journalled in a bush I5 seated in a lug I6 of the casing 3. A spring I'I acting on the shaft I3 tends to secure a gastight fit on the shaft I3 in the casing. Two studs I8, I9 are secured to the actuating arm I2; these studs engage cam faces 2l, 22, 23 on the rocking arm I0 of the main valve 8. The shape of these cam faces is such that when the actuating arm I2 for the auxiliary valve 9 is swung for the purpose of closing the by-passage 1, the rocking arm I0 of the main valve 8 is swung about its points II, in such a manner that the main valve 8 leads and closes the main passage 6 before the actuating arm I2 has adjusted the auxiliary vvalve 9 over the by-pass passage 1. Conversely, on the opening of the exhaust pipe, the auxiliary valve 9 is first moved out of the closure position by its rocking arm I2, and only after a partial opening of the by-pass passage 'I is the main valve 8 also removed from the main passage Ii. Before the main valve 8 is moved away from the port of the passage B, the auxiliary valve 9 opens the by-pass passage 1. The main valve 8 is thus already relieved of the pressure when it is adjusted.

When the main valve 8 is closed the stud I9 on the arm I2 slides along the cam face 23. The stud I9 locks the rocking arm I0, so that the main valve 8 cannot be swung out of its closure position before the actuating arm I2 has been adjusted again by the lever I4. The face 23 is a continuation of the face 22.

For limiting the movement of the actuating arm I2, stops 24, 25 are provided in the casing.

What I wish to claim and secure by U. S. Letters Patent is:

1. In a valve mechanism, a valve casing, a main pressure valve and an auxiliary pressure relief valve, in said valve casing, said casing having an inlet passage, and a partition wall provided with a main outlet passage and an auxiliary pressure relief passagethe main valve controlling the main outlet passage and the auxiliary valve controlling the auxiliary pressure relief passage, said valves being arranged for sliding movement in the same plane, a common actuating shaft for said valves, an actuating arm rigidly connected to said actuating shaft, said arm having said auxiliary valve mounted thereon, a lever pivotally mounted in said casing and having said main valve mounted thereon, and means on said arm for operatively engaging said lever, so that when said arm is rocked by the actuating shaft for closing the valve passages, the main valve is moved rst into position to close the main outlet passage, whereupon the auxiliary valve is moved into its closed position to close the auxiliary passage, said means on said arm during the valve opening movement of said actuating shaft causing an actuation of said lever to move the main valve to open position after the auxiliary pressure relief valve has been opened by said actuating arm.

shape of said cam faces being such that when;

said actuating arm is rocked to move the main valve into its closing position, the studs first move said lever and lock the same when the main valve has attained its closed position.

4. In a valve mechanism as dened in claim 1, in which the lever having the main valve mounted thereon is mounted on points in said casing.

5. In a valve mechanism as defined in claim 1 including abutments within said valve casing for limiting the rocking movement of said actuating arm in both directions.

EDWIN OETIKER. 

